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MX128

Audio Band Scrambler

CML Microsystems Plc 

CML Microcircuits

COMMUNICATION SEMICONDUCTORS

FX/MX128

Audio Band

Scrambler

D/128/2 January 2003

Provisional Information

Features

• Full-Duplex Audio Processing

• On-Chip Filters

• Carrier Rejection >55dB

• Uses IF (10.24 MHz) Clock

• Excellent Audio Quality

• Low Power Operation (3.0V)

• Battery Powered Portability

Applications

• Cordless Telephones

• Wireless PBX

• Two-Way Radio

• Leisure Radio

(FRS, GMRS, MURS, PMR446)

1.1 Brief Description

The FX/MX128 is a full-duplex frequency inversion scrambler designed to provide secure conversations.

The Rx and Tx audio paths consist of the following:

1. A switched-capacitor balanced modulator with high baseband and carrier rejection.

2. A 3.3 kHz inversion carrier (injection tone).

3. A 3100 Hz lowpass filter.

4. Input op-amps with externally adjustable gain.

The FX/MX128 uses mixed signal CMOS switched-capacitor filter technology and operates from a single

supply in the range of 3.0 to 5.5 volts. The inversion carrier's frequency and filter switching clock are

generated on-chip using an external 10.24 MHz or 3.58/3.6864 MHz crystal or clock input (selectable).

This device is available in the following package styles: 16-pin SOIC,TSSOP and PDIP.

© 2003 CML Microsystems Plc

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